/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/MeshNormals.h
Initialize the given NormalOverlay with per-face normals, ie separate overlay element for each vertex of each triangle.
static void InitializeOverlayToPerTriangleNormals ( [FDynamicMeshNormalOverlay](API\Runtime\GeometryCore\DynamicMesh\FDynamicMeshNormalOverlay) * NormalOverlay )